A few times that some of my members in the realm( and most recently myself) went through the nether portal, we got teleported somewhere totally different than the portal we had linked with the overworld.  I Believe that the nether "Math" is wrong and it tries to teleport us at the same coordinate as if we were in the overworld.  IE: a 1:1 coordinate instead of a 1:8 thats supposed to happen.  This caused 2 of my member to either be stuck in a wall and suffocate, or be stuck at over 50k blocks in the overworld( 7-8k blocks) away from their original supposed placement.  I do not know what caused it as it is not a certainty that the glitch will happen, but it is still a risk now to enter the nether, especially since some of our bases are super far away from one another.